diff --git a/doc/manual/installing.rst b/doc/manual/installing.rst
index 86d963e47..4cd516f4a 100644
--- a/doc/manual/installing.rst
+++ b/doc/manual/installing.rst
@@ -269,6 +269,8 @@ These steps are required to generate gateware bitstream (``.bit``) files, build
 
         $ python3.5 -m artiq.gateware.targets.kc705 -H nist_qc1  # or nist_qc2
 
+    .. note:: Add ``--toolchain vivado`` if you wish to use Vivado instead of ISE.
+
 * Then, gather the binaries and flash them: ::
 
         $ mkdir binaries